Razor blade sharpening machine



March 26, 1935. H. WATTS r AL RAZOR BLADE SHARPENING MACHINE Filed Sept. 19, 1933 Inventors Noble H.Watts,

Charles b 59 5 Their Attorney Patented Mar. 26, 1935 Our invention relates to razorblade sharpe 'ing machines and more particularly-to a razor blade sharpening machine driven by an'eleotric motor. 'In razor blade sharpening machines provided with a. leather stropping surface, difficultvhas been experiencedin the cuttingof the'leather 'by the razorblade. Thisis-generally caused by the blade being inclined at an incorrect angle to the roll when the rolls are advanced tosharpening position. The edge of the blade then cuts into the'leather-and eventually results in the stropping material becoming-severed, requiring renewal of the stropping surface. When the two edges of the blade'are sharpened "at the same time it mayhappen that. one of the rolls'ene gaging the blade in advance of "the other roll will tilt the blade at an angle so that when'the other roll moves into engagement with theedge the blade will cut the stropping surface. f'Also, unlessthe rolls are exactly positioned, one edge may be sharpened and the otheredge' may not even be engaged by the-other roll; Anob'ject of our f invention-isto provide'a razor blade sharpening machine inwhich the rolls are' so arrangedand'driven as to insure equal-and simultaneous engagement with the 0113- v posite edges of 'thebmd Another object-'of=*our"-invention is" to insure ,the -"proper. positioning of the razor blade on the supporting pins before the rolls are in "full en+ g'agement with the opposite '{edges so that the blade will*not-- extend at anangleto" the rolls which 'mayresult'indamage to the" stropping surfaces? A stilhfurtherbbjectfof ourinvention isjto provide "means to time the sharpening action. What we consider" to *be novel and our invention 'willbe better understood bv'referenc'e'to the following specification and appended claims when'considered in connection with the-accom panying'drawing, in which isa perspective view of asharpenerj Fig. 2 is a side e'levationin cross section; Fig. 3 is an end elevation in cross section; Fig. 4is a detail view of the rolliassembly; Fig.5 is a detail .view of the up-' per roll spindle; and Fig. 6 is an exploded view In'Fig. 4 the assembly of rolls l1 and 12 is bet-' ter indicated. R011 -11 ispivoted ion a tube 15. Roll 12 is carriedbya casing 16 and is pivoted in foval openings in the ends of casing'lfiby -means of spindle-17. -Tube' 15 passes' through "openings in the bottom end of casing 16;

l6 and roll '12 carried thereby are pivoted about spindle 18? which passes through tubel lfi and journaled jin "upstanding portions 19 f and "20 of plate '10 Which be seen in "Fig. '1'. Rolls 11. and '12'are provided with gears 21and'22. Spiralstropping surfaces 23 and 24 are'profvided on each of rolls 11' and 12 respectiyelm; and

so positioned that the'adjacentconvolutions 9n one roll are spaced between the adjacent con 'volutions on the a other roll. Relative radial movement of rolls 11 and 12 is permittedby' the p oval openings orfguides in which 'spindlelflfis journaledf fIo compensate for wear of: these stropping or sharpening surfaces 23 24, springs 25 and '26 are provided and engagefthe spindle 17 and tube 15. Springs 25 and 26 in addition to compensating for the w'earingof the sharpening surfaces provide a spring pressure between the rolls which remainsf'constantjand provides the sharpening pressure desired to ac-Y complish the-sharpening'of the razor blade; To protect springs 25*and 26 from wear due tojlthe adjacent rotating rolls 11' "and112, plates'z'lv and '28 are provided and located between'the 'ends'of 2'7 and 28 are provided with openingsfwhicfifit loosely 'on' spindlel'l and tube-15;]Groovesf29 t casing 16. "The construction of the'rolls'isfin-F dicated in Fig. "'6 in' wh'ich roll 11 is shown with its stroppi'ng surface 5 23"remove'd' from thev spiral groove-31 in which it adapted'to seat. Thegear '21 is' integral with. the roll 11. Opening-s '32 and 33'communicating with the central bore "of roll 11-are provided-at eachendjof spiral groove 31. Af longitudinal gro'ovef 13471}; also provided on theinnerfbore of} roll 1i in line with openings '32 and 33. i 1 The stropping is thus secured infspiral groove31with1itsjjends extending into openings'32 and 33 groove '34. *Thes'e ends'are locked position -uponthe insertion'oftwo end bushings 35 and; 36whichfit.

within the I central bore of tube 11. Bushings 35 and 36 may be aligned'andthe proper bear,- I

ing surface provided merely by: the drillingfof the openings of the bushing. I The assembly of rolls 13 and i4 is identical withthat of rolls l1, and lZ-and, as better "indicated in Fi'g.' 3,ifcas'-J ing '16 and casing 37 in which roll l4- is "carried are provided with extensions'38 and 39'respec 25 rolls 11"and 12 and springs 25"and 26. 'fgPlates I 0n the bottom of plate H a. motor stator 41 havingan armature 42'with a shaft 43 passing through anopening in the plate 10 is secured. Shaft 43 is provided with self-aligning bearings 44 anus, 'the'uppe 'bearingaiming secured in an opening or plate i'e'and the'iower bearing'45 ,by bearing support 46 which is secured with the stator to plate 10 by means of studs; 4'7. A

in bearing l'atkwserves: ee-eased thrust to the lower end of shaft 43. On the end ing gear secured to roll 13. In order to. insihe" quiet and eflicient operation,imn;21; js proyidedo with teeth inclined atthe angle of the thread or worm- 48. The teeth on gear -22'are'in'cline'd" at the same angle. Gears secured to rollslBand flare similarly'b iqvided with angularteeth. '{A in" "in f ig for "the"'r'notor' and related "p rt is yided, tofwhiclii plate lO is secured. :Asbest nflated-mp1s. 1; a hinged cover"501m l the is providediand'fhas integral cam surfaces T52 'whihar e adapted to engage casings 16 r 3 "to mov the'upperro11s 1'2and4l 4 from th inoperative position to which they'are biased pif rig401to' afiill operativeposition when the f50"is"i'nfthe'fullyclosed positioriQ sur amisz areSo' shaped asito move prollgs lz i1'4 inultaneously about the spindlesbf rolls "1'1 and; s 3; cove 50d'with the integral ams 51' andl'52ijprovides an impoaantireatureor li l 'ltiql l that they jinsure' simultaneous and equal-movement of the two rolls 1'2' and 14 the inoperative to the operative position he e d r .ofion r a n m side o ofitheraz'o'r blade be'foreithe other roll i s moved toj'aw corresponding,position. prevents the ro 1 ou we efi i iefis ge he. $910 bl de ffiQ t F L E- t "at n' t hii it, 9W3 intoithet strapping material on the other; u;

11 5- d 5 a w d-ip o P951- tiomng the jifazon blade between the rolls. j To control nergizationi'ofi,thef'niotor, swi i ;cl 1in g provided icoii'si'stinQ of astationaryicon; 'i a. 'fribvable contact 56gwhicl} i srcarried spring member :57 lwhich biases contact fifi H r geriientwitlfi stationarylcontact To ow o n d 5 71m ha men l im sta esconta'ct l'55 "af-"pli n v5 8 provided engaging spriiigjinember '57at one'end anqiaacarn surface 'rovidedcon easing 16 at the other end. I 'Ifhe can; l w i s Per it ntest 56.129 move'into engagementwith contact as 'ltlresrolls are? moved t'ol operative position upon the; closure ofthe' cover 50 "Also, the:contac' t s,5 5 and'56are in engagement before the (r6115. arelmoved to the fiillfop'erajtive position that when zthe upper rolls first'engagethe'razor blade they are rotating u'ch a. ,dirfectionlas' to, force'f-the. razor -blade into"normal positionon the bottom-rolls ll 33f it 'was'not properly se'ated beiorecover 5pwasclosed; v 'Ihisarrangement further: insures e of shaft 43 worm gear 48 lls securedfwh ich'cn gages gear 21 secured to roll l'l anda'cormsmmwr los d: tho g h iihte me an cbn i ed o er t on for S c a vl es hie times 'damageto the motor moons pja ration of 1 :5 di n b riana m. ,5 u g-ah .cpntrol the deener l tiq ofrth niotor upon the against the bias. of spring 61 is accomplished by a pin 62 which is engaged by a cam surface on casing 37 as the rolls are moved to the inoperative position by spring 40. A bimetallic thermal strip 63 is provided which is adapted to latch 5 i tontacts 59 and are connected in series in the tmgtor-cirmtwithothe contacts 55 and 56. When the -ro are subsequently moved to operative positiom-pirr fiz nblo'nger holds contacts 59 and fibdn' 'tngagemenfflbut thermal strip 63'1atches them closed. A-thermal coil 64'is provided con- ..oi the motor and surrounds the thermal strip 63. When'the motor is run fdrasuflicient time to, sharpen the blade 7 the er a strip fll ouw n a ement-wi S ring m mb rs 61: a d: arm l con act 59 and, 59' 6 s ar e .c e i s n rs z tiqn o xiiotorf Itis also to be noted that if cove is opened causing-comma??? 39 w contacts wiin .nqt latched closed b strip i6 3untiljiithas moved back t o position. This ,"regulates the. timingof shagpfllgiflg' l e' an 'P n an. w h etineosaq th motor by'repeated use of the sharpeningmachine re e. motor hasfih e i i 'e tq 1 01? b na on;f.- h 1tb r el' a hi m etawi the contacts in the circuit or the motorf'ma kes it possible to usea'motor which isijustgsufliciently 'e j e fo 'fihei ce w a enin o eration without the; dangerlof ftheimotor being in t'ojcause totheinsulation b the 0 heating'lofitfie motor.

, r l h or itwi l .-v ea-h t .o b a rpe ng Tmesmne is -un erifi d: w th man'for nm t'i g ha tm pinemiss s b uring theprimer eating b ade sit r l e mw o e o e fir ween-agile tion er a ntr fievi dr-wl e res lt-lies p the sharpening acti onjlandgnakes possible a compact ma t e e-Q l o the o g i ensefins'li ewl 9 ning action thrqughou uproott wi h mummies stm n ztb m d vi lefi ee sired;

What we claim as new and desire toseouregby;

1. a e erhle ee ere n es mg a ate a m ens siwr edi nione pl t a ur ts meai s will h t sqea edate H o v. s. A 'eai-torr sei mete eans b e m re t oll a eel-im erativo' i p s ivq sw ri e sawmi s-swam Y e he a l -m Op i ne n oft-the cover, and;switchipggmeansactuatedupon lb m said iv t wqvercwnwntro he; en: .ergizatien oi said motor;

2. A razor bladeshar imchmeediapie; an p te a m n dr rbt fi n s dw' sa blet, a a y. f sh te nii etrc ls ww a hI r :fid $3 necting said motor and said rolls; {9r

saidflmotor, means biasing said rolls t i1;0peratwe position, lapivoted cover: for said. rolls ta means actuated upon closure of said pivoted cover to complete energization of the motor, and thermal control means adapted to deenergize' the motor upon a predetermined temperature rise.

3. In a razorblade sharpening machine, two rolls, sharpening material wound spirally with spaced convolutions about each roll, a gear on one roll meshing with a corresponding gear on the other roll, a casing, a spindle "for one roll pivoted in bearings in said casing, a tube passing through the other roll and pivoted in openings in said cas-v ing, a support for said rolls, and a spindle pass ing through said tube and secured in upstand ing portions of said support.

4. In a razor blade sharpening machine, two rolls, sharpening material wound spirally with ing a plate, a motor stator secured to one side of said plate, a motor armature having a shaft passing through said plate, a worm gear on the end of said shaft passing through said plate, a roll pivoted in upstanding portions of said plate and having a gear meshing with said worm gear, a second roll having a gear meshing with the gear on said last named roll, means biasing saidrolls toward each other, means biasing said last named roll to inoperative position, means to move said roll against said biasing means to operative position, switching means actuated upon the movement of said roll to operativeposition to completeenergization of said motor, and thermal control means actuated upon a predetermined rise in temperatureof said motor to deenergize the motor. g

6. razor blade sharpening machine comprising a plate, a motor secured to said plate, a shaft connected to said motor and passing through said plate, a worm gear on the end of the shaft, rolls secured to said plate and having gears engaging opposite sides of said worm gear, rolls having gears engaging 'the gears of said first named rolls, means pivoting said last named rolls for movement about the axis of said first named rolls, resilient said motor, thermal control means actuated upon a predetermined temperature rise of said motor to deenergize the motor, and switching means actuated by the movement of another of said second named rolls to replace said thermal control means in operative position after the deenergization of the motor thereby.

7. A razor blade sharpening machine compris ing a plate, a motor stator secured to one side of said plate, a motor armature having a shaft Y 25: end of said shaft, a roll pivoted in upstanding passing through said plate, a worm gear on the portions of said platean'd having a gear meshing with said worm gear, a second roll having a gear meshing with the gear on said last named roll, means biasing said rolls towardeach other, means biasing said last named roll to inoperative position, means to move said roll againstsaid biasing 'means to operative position, switching means actuated upon the movement of said roll to operatermined time to 'deenergize the motor.

NOBLE, H. wA'r'rs.

CHARLES A. CLAUSS. '40 I I 

